Adding Multiple Values to a Smart List Filter Using a Text Type Field
Issue
You want to add multiple values to a Smart List filter as described here: https://docs.marketo.com/display/public/DOCS/Add+Multiple+Values+to+a+Smart+List+Filter . However, when you go to do so for a field that has a type of "Text" you are not able to add multiple values.
Solution
This is expected behavior for Marketo Text fields. As a workaround, you can add the same filter to the Smart List multiple times, one for each value you want included.